the 2.10 is 5 oz heavier than the 1.8 adn the carbon fiber gear I had to add added another oz. so I added a total of 6 or so oz to the front .......I hope I can move the batt back so I can get it to balance .......but I was wondering if anyone who had this plane has flown it with this set up ....i am kinda scared......it should have its second maiden ater this week